1. Key Links
The following Problems are from the Key Links workbooks and are practice for the Stanford 9 test.

2. Key Links You will have 1 practice and 2 test grades.
You will get to correct you first test grade to get a better grade after redoing the test.

3. Key Links
1.) Plug in the 30 mph and then the 40 mph and find the difference.
= 45 (B)

4. Key Links 1.) y = x + x2/20 y = 40 + 80 y = 30 + 45 y = 120 y = 75
Difference = 45

5. Key Links
2.) In this problem remember that you can’t solve 1 equation with 2 variables, you need 2 equations. So…. You are just looking for 1 of the equations that you might be able to use to solve the 2 equations for x and Y. That’s why there is no equation that handles the fact that there were 4 times the amount of student tickets sold.

6. Key Links 2.) 3.2x + 2y = 2800 y = 4x so….. 3.2x + 2(4x) = 2800
x = so… y = 1000

7. Key Links
3.) Plug 24 in for h in the equation and simplify the radical.

8. Key Links
3.) d = h
d = (24)
d =
d = 6

9. Key Links
4.) Solve for x to find the Max # of sacks in the truck.

10. Key Links
4.) x 16,000
100x ,500 x

11. Key Links
5.) Skip
6.) Work backwards by plugging in the table of values to find the 1 equation that is true in ALL cases.

12. Key Links 6.) d = n(n-3)/2 0 = 3(3-3)/2 2 = 4(4-3)/2 5 = 5(5-3)/2
9 = 6(6-3)/2

13. Key Links
7.) Find the correct line by eliminating all those the are negative sloping lines and then use Rise / Run.

14. Key Links
7.) C y = 5/3x + 0 Y
rise = 5
run = 3 X

15. Key Links
8.) Eliminate 2 then make a table.

16. Key Links 8.) y = (x-1)2 +2 3 = (0-1)2 +2 plug in(0,3) 3 = 3
2 = 2

17. Key Links 8.) cont… y = (x-1)2 +2 3 = (2-1)2 +2 plug in(2,3) 3 = 3
So…. y = (x-1)2 +2 is the correct equation for the graph..

18. Key Links
9.) Find the areas of each smaller part of the bigger Rectangle. x
x2 +x+x+x+x+x+x+x =
x2 +7x + 12 x x x2 x x x x 1 1 1 1 1 x 1 1 1 1 1 x 1 1 1 1 1

19. Key Links 9.) (x + 3)(x + 4) x2 + 3x + 4x + 12 x2 + 7x + 12 111 1 x x

20. Key Links 10.) Convert to inequality signs. x < 100 y > 10
Use the greatest possible value for x (99) and the smallest possible value for y (11). Then find the one that must be true.

21. Key Links 11.) Create 2 equations 2x + 2y = 34 x - 2y = 2
Then use linear combination to solve.

22. Key Links 11.) 2x + 2y = 34 x - 2y = 2 3x = 36 x = 12 2(12) + 2y = 34
2y = 10 & y = 5

23. Key Links 12.) x - y = 6 2x - 2y = 8 y = x - 6 y = x - 4 Y y = -x + 2

24. 13.) 2x - y > 6 2x + 3y < 18 y < 2x - 6 y < -2/3x + 6
Key Links
13.) 2x - y > x + 3y < y < 2x y < -2/3x + 6
2x + 3y < 18 Y X
Shaded Area
2x - y > 6

25. Key Links